aa4298859f
* Created p4runtime exercise directory with draft P4 program * Updating VM - Adding p4 to vboxsf group for VirtualBox Shared Folders - Adding gRPC Python package for p4 runtime - Setting up VM to use 2 CPUs * Updating .gitignore for PyCharms and Mac OS * Adding P4RuntimeSwitch type and support in run_exercises If the grpc switch target is used, we will instantiate a P4RuntimeSwitch. Ideally, this will get merged with BMv2's P4Switch and can be removed * Adding p4 runtime and p4info browser libraries Also, adding a Makefile for this project
126 lines
4.5 KiB
Python
126 lines
4.5 KiB
Python
# Copyright 2017-present Barefoot Networks, Inc.
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# Copyright 2017-present Open Networking Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import sys, os, tempfile, socket
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from time import sleep
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from mininet.node import Switch
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from mininet.moduledeps import pathCheck
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from mininet.log import info, error, debug
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# this path is needed to import p4_mininet.py from the bmv2 repo
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sys.path.append('/home/vagrant/behavioral-model/mininet')
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from p4_mininet import P4Switch
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class P4RuntimeSwitch(P4Switch):
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"BMv2 switch with gRPC support"
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next_grpc_port = 50051
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def __init__(self, name, sw_path = None, json_path = None,
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grpc_port = None,
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pcap_dump = False,
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log_console = False,
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verbose = False,
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device_id = None,
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enable_debugger = False,
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**kwargs):
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Switch.__init__(self, name, **kwargs)
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assert (sw_path)
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self.sw_path = sw_path
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# make sure that the provided sw_path is valid
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pathCheck(sw_path)
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if json_path is not None:
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# make sure that the provided JSON file exists
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if not os.path.isfile(json_path):
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error("Invalid JSON file.\n")
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exit(1)
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self.json_path = json_path
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else:
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self.json_path = None
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if grpc_port is not None:
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self.grpc_port = grpc_port
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else:
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self.grpc_port = P4RuntimeSwitch.next_grpc_port
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P4RuntimeSwitch.next_grpc_port += 1
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self.verbose = verbose
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logfile = "/tmp/p4s.{}.log".format(self.name)
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self.output = open(logfile, 'w')
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self.pcap_dump = pcap_dump
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self.enable_debugger = enable_debugger
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self.log_console = log_console
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if device_id is not None:
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self.device_id = device_id
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P4Switch.device_id = max(P4Switch.device_id, device_id)
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else:
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self.device_id = P4Switch.device_id
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P4Switch.device_id += 1
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self.nanomsg = "ipc:///tmp/bm-{}-log.ipc".format(self.device_id)
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def check_switch_started(self, pid):
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while True:
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if not os.path.exists(os.path.join("/proc", str(pid))):
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return False
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.settimeout(0.5)
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result = sock.connect_ex(("localhost", self.grpc_port))
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if result == 0:
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# TODO It seems like sometimes BMv2 can hang if multiple instances start up too quickly;
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# this sleep might also do nothing...
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sleep(0.5)
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return True
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def start(self, controllers):
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info("Starting P4 switch {}.\n".format(self.name))
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args = [self.sw_path]
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for port, intf in self.intfs.items():
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if not intf.IP():
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args.extend(['-i', str(port) + "@" + intf.name])
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if self.pcap_dump:
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args.append("--pcap")
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if self.nanomsg:
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args.extend(['--nanolog', self.nanomsg])
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args.extend(['--device-id', str(self.device_id)])
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P4Switch.device_id += 1
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if self.json_path:
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args.append(self.json_path)
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else:
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args.append("--no-p4")
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if self.enable_debugger:
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args.append("--debugger")
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if self.log_console:
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args.append("--log-console")
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if self.grpc_port:
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args.append("-- --grpc-server-addr 0.0.0.0:" + str(self.grpc_port))
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cmd = ' '.join(args)
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info(cmd + "\n")
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logfile = "/tmp/p4s.{}.log".format(self.name)
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pid = None
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with tempfile.NamedTemporaryFile() as f:
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self.cmd(cmd + ' >' + logfile + ' 2>&1 & echo $! >> ' + f.name)
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pid = int(f.read())
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debug("P4 switch {} PID is {}.\n".format(self.name, pid))
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if not self.check_switch_started(pid):
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error("P4 switch {} did not start correctly.\n".format(self.name))
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exit(1)
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info("P4 switch {} has been started.\n".format(self.name))
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